Small space or large, the humble sleeper sofa can be the perfect multi-purpose furniture. During the daytime it's a plain ol' sofa, perfect for TV viewing and hanging out. As night falls, it converts to a cozy sleeping space for you or your overnight guests. This updated list of best sofa beds sees some old standbys along with some new additions. Check them all out and be sure to sound off in the comments with your own opinions. More